Use react-google-analytics.

lib/components/App.js

@@ -3,6 +3,10 @@ import FrozenHead from 'react-frozenhead'
 import React from 'react'
 import SupportStore from '../stores/SupportStore'
 import { RouteHandler } from 'react-router'
+import ga from 'react-google-analytics'
+
+ga('create', 'UA-62785624-1', 'auto');
+ga('send', 'pageview');
 
 export default class App extends React.Component {
 
@@ -46,14 +50,7 @@ export default class App extends React.Component {
           ? <RouteHandler />
           : <ErrorPage />}
         <script>FilePizza()</script>
-        <script>
-        (function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
-          (i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),
-          m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m)
-        })(window,document,'script','//www.google-analytics.com/analytics.js','ga');
-        ga('create', 'UA-62785624-1', 'auto');
-        ga('send', 'pageview');
-        </script>
+        <ga.Initializer />
       </body>
     </html>
   }

package.json

@@ -31,6 +31,7 @@
     "peer": "^0.2.8",
     "react": "^0.13.0",
     "react-frozenhead": "^0.3.0",
+    "react-google-analytics": "^0.2.0",
     "react-router": "^0.13.1",
     "socket.io": "^1.3.5",
     "stylus": "^0.50.0",